Error in Text. In the Clinical Sciences article titled “Outcome of Toric Intraocular Lens Implantation After Adjusting for Anterior Chamber Depth and Intraocular Lens Sphere Equivalent Power Effects” published in the August issue of the Archives (2011;129[8]:998-1003), the standard empirical thick lens “vertex power” formula in the right column of page 999 should have appeared as follows: “ E = F/[1 + (d/1.336)F].” All calculations discussed in the article were performed using the correct formula, so the published data are correct. Only the formula, as it appears in the article, is incorrect.